[1] : The Collaborative International Dictionary of English v.0.48

hackmatack \hack"matack`\ ha^k"m.ata^k`, n. of
   american indian origin. bot.
   the american larch larix americana, a coniferous tree
   with slender deciduous leaves; also, its heavy, close-grained
   timber. called also tamarack.
   1913 webster
see also:
larix americana tamarack 

[2] : The Collaborative International Dictionary of English v.0.48

larch \larch\ laumrch, n. cf. oe. larege cotgrave, it.
   larice, sp. larice, alerce, g. laumrche; all fr. l. larix,
   -icis, gr. la`rix. bot.
   a genus of coniferous trees, having deciduous leaves, in
   fascicles see illust. of fascicle.

   note: the european larch is larix europaea. the american
         or black larch is larix americana, the hackmatack or
         tamarack. the trees are generally of a drooping,
         graceful appearance.
         1913 webster
see also:
fascicle larix europaea larix americana 

Larix >> L Words
Larix, definition of term: Larix
larix_pag1.html

Americana >> A Words
Americana, definition of term: Americana
americana_pag1.html